Gramlich John W, Murphy Thomas J
National Institute of Standards and Technology, Gaithersburg, MD 20899.
J Res Natl Inst Stand Technol. 1989 Jul-Aug;94(4):215-220. doi: 10.6028/jres.094.022.
A method has been developed for the determination of trace level iodine in biological and botanical materials. The method consists of spiking a sample with I, equilibration of the spike with the natural iodine, wet ashing under carefully controlled conditions, and separation of the iodine by co-precipitation with silver chloride. Measurement of the I/I ratio is accomplished by negative thermal ionization mass spectrometry using LaB for ionization enhancement. The application of the method to the certification of trace iodine in two Standard Reference Materials is described.
已开发出一种测定生物和植物材料中痕量碘的方法。该方法包括向样品中加入碘，使加入的碘与天然碘平衡，在 carefully controlled conditions（应改为“严格控制的条件”）下进行湿式灰化，以及通过与氯化银共沉淀分离碘。碘/碘比的测量通过使用 LaB 进行电离增强的负热电离质谱法完成。描述了该方法在两种标准参考物质中痕量碘认证方面的应用。
